Nalgene MultiDrink Bottle

Nalgene's MultiDrink Bottle offers two ways to drink: a flip-up straw for sipping and a screw-off cap for big gulps. Testers said the bottle was easy to open and close and comfy to carry, thanks to a built-in plastic loop. But it leaked frequently in our tests — a big drawback. The manufacturer promotes this bottle as BPA-free. nalgene.com.